The most common garden fence height is 6ft (1.8m) and the minimum fence post length for this height will be 8ft (2.4m). If you have a gravel board or a trellis remember to allow for this on top. A minimum of 600mm or 2ft needs to be embedded into the ground.
Concreting in fence posts can be done with either a mixture of ballast and cement, (approx. mix; 6:1) or postfix. The amount required of either product depends on the size of the hole that the post is going into.
When concreting fence posts into the ground the fence posts should be buried a minimum of 600mm into the ground and the concrete is to be placed around the post, but not underneath. If a fence post has the concrete underneath as well as around the sides the concrete can trap water and therefore soak the post greatly increasing the chance of decay.
If the ground the fence post is sunk into is not free draining soil then a small layer of shingle can be placed under the fence post (with the post still sunk approximately 600mm into the ground), to help drainage occur.
Concreting in is not suggested for use with pointed posts.
One possible method of fixing a fence post into the ground is back ramming. This is done by digging a hole only a little larger in width than the fence post you are supporting, placing the fence post in the hole and then backfilling with soil and ramming to support the fence post. The soil should be back filled and rammed bit by bit rather than all at once to ensure a good hold.
This method of securing the fence post is not suggested if the ground you are securing the post into is soft or loose.
AVS stocks the metpost range and these can be used as an easy alternative to other post erection methods. Their main advantage is one does not have to dig a fence post hole. They are commonly used in the erection of panel fences. AVS recommend these are not used in locations exposed to high winds.
When using these supports please bear in mind that if the ground is stony or debris rich, the metal support post can be thrown off course and an alternative erection method may be advisable.
Finally, the metal support posts do not suit circular fence posts such as peeled & treated or machine round.
When driving in fence posts, it can be possible to damage the post if care is not taken. The use of certain tools can greatly reduce the risk of damage. Tools such as a stake driver (suggested for low height posts, due to angle of use when striking the post) or a post rammer are examples of such tools.
Another method is to use a block of wood placed on top of the fence post, so that the block of wood takes the damage instead of the post. This is more difficult on your own and would usually require two people, one to hold the block the other to hit it with a hammer.
Again, when driving in fence posts, beware of large stones or debris that may throw the alignment of the fence posts off course. Another method around this could be to use a fencing bar to clear a guide hole.